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- W2061391569 abstract "Rat 3-hydroxyisobutyrate dehydrogenase shares sequence homology with the short-chain alcohol dehydrogenases. Site-directed mutagenesis and chemical modifications were used to examine the roles of cysteine residues and other residues conserved in this family of enzymes. It was found that a highly conserved tyrosine residue, Y162 in 3-hydroxyisobutyrate dehydrogenase, does not function catalytically as it may in other short-chain alcohol dehydrogenases. Of the six cysteine residues present in 3-hydroxyisobutyrate dehydrogenase, only cysteine 215 was found to be critical to catalysis. C215A and C215D mutant enzymes were catalytically inactive but produced CD spectra identical to wild-type enzyme. C215S mutant enzyme displayed a lowered Vmax than wild-type enzyme, but Km values were similar to those of wild-type enzyme. The C215S mutant enzyme was inactivated by treatment with phenylmethanesulfonyl fluoride but was not inactivated by treatment with iodoacetate, whereas the wild-type enzyme was inactivated by treatment with iodoacetate but not inactivated by treatment with phenylmethanesulfonyl fluoride. The present data suggest that 3-hydroxyisobutyrate dehydrogenase differs in mechanism from other short-chain alcohol dehydrogenases studied to date and that cysteine 215 has a critical function in catalysis, possibly as a general base catalyst." @default.
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- W2061391569 date "1995-04-04" @default.
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- W2061391569 title "Chemical Modification and Site-Directed Mutagenesis Studies of Rat 3-Hydroxyisobutyrate Dehydrogenase" @default.
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- W2061391569 doi "https://doi.org/10.1021/bi00013a012" @default.
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